Maxim MAX31914 Ultra-Low Power Translator translates and conditions the 24V digital output of sensors and switches. These are used in industrial, process, and building automation with 5V CMOS-compatible signals required by microcontrollers. These provide the frontend interface circuit of a programmable logic controller (PLC) digital input module. The signal voltage translation is performed in conjunction with input current limiting and low-pass filtering. Input current limiting allows a significant reduction in power consumed from the field-supply voltage, as compared to traditional discrete resistor-divider implementations. To achieve the lowest in-class power dissipation, the IC uses patent-pending circuit techniques to achieve further reduction of power dissipation beyond what is possible by input current limiting alone. This special low-power operating mode is automatically activated when on-chip low-pass filtering is selected.